Dawid "Zetalot" Skalski, a professional Hearthstone player and streamer from Poland, is the master of the Priest class. He plays Priest 99% of the time and he knows all the possible archetypes like no one else.
His Quest Priest deck went through multiple changes, and this list is one of his most interesting ones. It has lots of cheap Deathrattle minions that will allow you to finish the Quest early in the game, so you can heal with the help of Amara whenever you need it.
N’Zoth is an obvious choice for this deck as well. If you lose your board, you can immediately reinstate your oppression with the help of this powerful legendary.